netdev - Re: [PATCH net 1/2] of: of_mdio: Add a whitelist of PHY compatibilities.

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Message-ID: <56A8CB6A.2070101@cogentembedded.com>
Date:	Wed, 27 Jan 2016 16:51:38 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	aaro.koskinen@...ia.com, olof@...om.net
Subject: Re: [PATCH net 1/2] of: of_mdio: Add a whitelist of PHY
 compatibilities.

Hello.

On 01/27/2016 03:11 AM, Andrew Lunn wrote:

> Some phy nodes list a compatible value indicating the PHY make/model.
> This is never used to match the device to the driver. However it does
> confuse the code to separate a PHY from a generic MDIO device like a
> switch. Generic MDIO devices must have a compatible value, PHYs can
> list clause 22 or 45, but nothing else.
>
> Issue a warning if we find a compatible value known on the whitelist,

    My spell-checker trips on "whitelist"... Perhaps a space/hyphen needed?

> and say it is a PHY.
>
> Fixes: a9049e0c513c ("mdio: Add support for mdio drivers.")
> Reported-by: Aaro Koskinen <aaro.koskinen@...ia.com>
> Reported-by: Olof Johansson <olof@...om.net>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>   drivers/of/of_mdio.c | 27 +++++++++++++++++++++++++++
>   1 file changed, 27 insertions(+)
>
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index b5aa004a24b6..26c245041493 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -143,11 +143,31 @@ int of_mdio_parse_addr(struct device *dev, const struct device_node *np)
>   }
>   EXPORT_SYMBOL(of_mdio_parse_addr);
>
> +/* The following is a list of PHY compatible strings which appear in
> + * some DTBs. The compatible string is never matched against a PHY
> + * driver, so is pointless. We only expect devices which are not PHYs
> + * to have a compatible string, so they can be matched to an MDIO
> + * driver.  Encourage users to upgrade there DT blobs to remove these.

    s/there/their/.

[...]
> @@ -166,6 +186,13 @@ static bool of_mdiobus_child_is_phy(struct device_node *child)
>   	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
>   		return true;
>
> +	if (of_match_node(whitelist_phys, child)) {
> +		pr_warn(FW_WARN
> +			"%s: Whitelisted compatible string. Please remove\n",

    White-listed?

[...]

MBR, Sergei